... monitored¹

For simplicity, we omit the discussion of personnel cost involved in administering and maintaining an IDS.

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...R²

Precision describes how accurate a prediction is. If P is the set of predictions with label i and W is the set of instances with label i in the data set, by definition, $p =\frac{\vert P\cap W\vert}{\vert P\vert}$.

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